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linux-user: Adjust guest page protection for the host 

Executable guest pages are never directly executed by
the host, but do need to be readable for translation.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200519185645.3915-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2020-05-19 11:56:45 -07:00 committed by Laurent Vivier
parent 9dba3ca5af
commit 4eaa960dbc
1 changed files with 5 additions and 1 deletions
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6
linux-user/mmap.c
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@ -76,8 +76,12 @@ static int validate_prot_to_pageflags(int *host_prot, int prot)
* don't bother transforming guest bit to host bit. Any other
* target-specific prot bits will not be understood by the host
* and will need to be encoded into page_flags for qemu emulation.
*
* Pages that are executable by the guest will never be executed
* by the host, but the host will need to be able to read them.
*/
*host_prot = prot & (PROT_READ | PROT_WRITE | PROT_EXEC);
*host_prot = (prot & (PROT_READ | PROT_WRITE))
| (prot & PROT_EXEC ? PROT_READ : 0);
return prot & ~valid ? 0 : page_flags;
}